Unregistered polygamous marriages pose serious problems related to the protection of wives' inheritance rights in Indonesia. This study aims to analyze the protection of wives' inheritance rights in unregistered polygamous marriages according to Islamic law and the implementation of the principle of justice in that context. The research method used is normative juridical with a library approach, using primary, secondary, and tertiary legal materials analyzed through legal interpretation, descriptive-analytical analysis, comparative, and maqashid sharia. The results of the study indicate that from an Islamic legal perspective, wives in unregistered polygamous marriages still have the same inheritance rights as regulated in the Qur'an, Surah An-Nisa, verse 12 and the Compilation of Islamic Law Article 180, namely 1/4 if the husband leaves no children and 1/8 if the husband leaves children, which are divided equally among all wives. However, in the practice of positive law in Indonesia, unregistered marriages face legal obstacles that cause wives' inheritance rights to not be optimally protected. The implementation of the principle of justice faces challenges in the form of legal dualism between religious legitimacy and state recognition, unequal access to legal protection, and minimal public understanding of wives' inheritance rights. From the perspective of maqashid sharia, this lack of legal protection violates the principles of hifdz al-nasl (protection of offspring) and hifdz al-mal (protection of property). This study recommends five strategies to achieve justice: facilitating access to marriage itsbat, increasing legal socialization, strengthening judges' judicial ijtihad, integrating maqashid sharia into legislation, and developing alternative mechanisms for resolving inheritance disputes.
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